sanford



'3 Sheets-Sheet 2.'

W. SANFORD. 'Hof Air Furnace,

Patented June 22541869.

3 Sheets-l-Sgheet 3. W. SANFORD. L

Hot Air Furnace.A

No. 91,569. y n Patent'ed June 22, 1869.

'iu Hot-Air Furnaces;

waited 5mm patent 7 @tilt-iw.

WATSON SANFORD, OF BROOKLYN, NEW YORK.

Letters Patent No. 91,569, dated June 22, 1869.

The Schedule referred to in these Letters Patent and making -part of the same,

all lwhom it may concern.-

Be it known that I, WATSON SANFORD, of the city `of Brooklyn, county of Kings, and State lof N ew York,

Figure 2 is a horizontalv section, taken inv the linel A a of lig. l; l

Figure 3- is a cross-vertical section, taken at theline Bbofg.2;

Figured is a plan view; and j Figure 5 is a plan view of the grate on'an enlarged scale.

My improvements relate to and are designed to render more efficient the furnace patented by me on the th'day of May, 1862, their main object being to effeet a better distributiomand hence a greater utilization of the products of combustion; also, to more rapidly free the body of live coals of cinders. y

I propose combining with a'series of side ues,lwh ich are exterior to the dome of'- the lire-pot, and arranged vertically, or nearly so, but openingrinto `the fire-pot horizontally, a centre feed or 'coal-receiver, th u's permitting the'flues soconstructed, and with such an iinproved combination and arrangement of dome and centre feed, to perform their functions the better, by more perfectly heating' them, thefueljheing spread to ward these side fines, `and the gases confined within the small space formed between the centre feed and sides of the dome are the morequickly andA completely forced back to the series'of outside dues, thereby heating the latter to of fuel.

I further make this centre feed so that it can be taken oi o1' replaced, in the manner described, without necessitating the removal of other parts 'at same time. i

I also divide, and thereby distribute more fully the products of combustion after they have passed up the vertical side dues ofthe furnace, and thus, by providing for" their further retention and circnitous passage,

get more caloric from the'samc amount of fuel without increasing the number of lilies, or occupying space required 'for the storage of hot air.

In this horizontal flue I introduce a valve or Opening, with which to check or retardithe passage through such flue of the products of combustion.

I also,- by improving the .construction of the grate, cause the cinders, as they are shook lby the motion of the grate, to be caught and more thoroughly crushed, so that they pass quickly and readily to the ash pit.

l will now proceed to describe, ,by means of the aca higher degree with a less amount- Y ion-plate, It, by constructing such conipanymg drawmgs, these general features of my invention, the same letters of referenceindicatingcorresponding parts in the several figures'. Y

a af, &o.,'are the side fluc s,-opening into the furnace at a point of the lire-box'abo'ut where the surface of the fuel Ordinarily reaches, the centre feed-b supplying the fuel, thusA preserving these fines, so positioned, from being rendered lessefficient, as wouldbe the case in feedi "ing overthe surface ofthe bed'offuel from -the usual sfide coalfreoeiver c.` This side receiverca'n bie-retained', however, and mainly 's crveasa ,window or door, being furnished with isinglass',' throu`gh lwhich to see the con-l dition ofthe tire. Y

Fig-3, of the drawings, shows, by red line, the side, in case the side receiverfc ls not included in the construction ofthe furnace, there being, in such case, an' opening, provided with a door containing mica, if de-l sired,` at the point al;v ,v H

The depth of thislcentre feed is sufficient to admit of its preserving a surface uponl a bed of fuel reaching up to or a littleabovethe lower end of the side fines. This`centre feed can'be cylindrical, (as shown lin the drawings,) square, or other convenient form, as may be desired, andm yhavea coalreceiver vprojecting outward and obliquely from the top, similar to c, for greater .Convenience in feeding;v

'This centrefeedfhasa knob, or other vsuitable projection at e, which rests onV the projection f,.when the `device has been inserted 'within' the furnace; and opposite theretoisattached, to the inner side ofthe furnace, a button," g, which, when turned up-against the projection h, ou lthe side ofthe centre-feed b, contiguous thereto, locks the device securely and safely in place.

thev products of combustion from the fines au, Sto., and may extend a portion of the way, (as shown in the drawing,) or all the way round the body'of/the furnace,

In this horizontal flue I am enabled to place a. divistlue in two sections, and then bolting the sections together at intervals, (the edge of vthe plate being .7 i '850. v

In the form of horizontal ilne shown in the drawings, acil'culatiou is made around this division-plate to the upper section of the iiue, by leaving spaces between each end of the plate and the end plates K K.

In case the flue extends all the way round, spaces in the division-plates are left at the front, which will. bring the products of combustion round to the front, and up through -such spaces to the upper side ofthe divisionplate, from which they pass through the upper section of the fine to the aperture of the smoke-pipe;

These end plates K K have openings in them, which form valves, for the introduction of currents of cold air.

In case of the horizontal flue extending all the way It is the horizontal fine, through 'which are carried between,) as seen at round, such valves are to be placed at any desired or convenient point.

I place the circular grate m upon a swivel-pin, u, which is at the centre of the grate-bar, or supporto, the circular grate having, for some distance'from this pin n., a circular` opening, which permits of there being placed upon the bar, within this opening, two projections, or lugs, p p, said lugs having their longest sides facing each way 'of the length of the grate-bars orsupport, and such .sides are angled, or corrugated, and the ring, or collar q, upon the pin n, and the interior of the smaller or inner circular bar r,of the grate, have also angled projections, or spurs uponthem, so that when the grate receives a reciprocal horizontal motion,

lfor the purpose of freeing the lire of ashes, the cinders will pass down to and become engaged with these projections, or spurs, ,or with the projections upon the one or theother, and be crushed to ashes, by reason of such contact and a contact with the uneven vand sharp surfaces rof the stationary lugs p p on the bar.

These lugs might be employed without the aid of K the projections upon the lsurrounding portions of the grate with advantage.

This construction of grate can be applied, aswell as the other improvements above described, to many of the heating and cooking-apparatus as well as stoves at present in use, and the application is not intended to be confined or limited to hot-air furnaces proper,

Claims. 1. A centre feed, arranged relatively to and i-n connection with a. series of side ilues and the horizontal top Jdue connected to the latter, when such side iues are exterior to and open horizontally into the tire-pot, substantially as described. v A

K 2. A horizont-al flue or fines, constructed with a division-plate, in combination with side dues, substantially as described.

3. A horizontal fine or flues, constructed with a division plate, in combination with a valve or valves, substantially as described.

'4. The arrangement, in combination .with a horizontal flue or4 fines, constructed with a division-plate, of a valve or valves, substantially as described.

5. The centre feed b, attached to the dome by means of the projections h c f, and button g, in manner shown and described.

6. The arrangement of lugs, or projections upon the grate-bar support o, in connection with spu/rs, or pro jections upon either the inner ring of the horizontal grate, or upon the collar of the centre-pin; or both, when constructed and operating substantially as described. v

4 WATSON SANFORD.

Witnesses EDWARD LYON, Jr., WM. F. MGNAMARL 

